Steel alloy



Patented June 8, 1926. i i v g UNITED STATES PATENT OFFICE.-

mmo STRAUSS, F ESSENI-BBEDENEYI, G RMANY, nssreuon :ro'rnrnn. utor? nxurmnensnnnscnur, on nssnn-on-rnn-mnm', Grimm.-

swam. ALLOY.

Io Drawing. Application filed July 17, 1923, Serial sm. 652,129, and in Germany August 2, 1922;

This invention relates to steel-alloys with per cent of carbon obtain a particularly high 7 18 to 30 .per cent oftchromium and 20 to 4. resistibilityagainst the attacks by sulphur is per cent of nickel to be used for manufacturous acid: at a high pressure and high teming articles (vessel's,pipes,..machinery parts perature. ,Besides, the said addition will etc.) which require ahigh resi'stibility give to the steel alloys excellent properties of against the attacks bg sul hurous acid at a strength. hightemperature an .hig pressure, and it Claim. resides'in thatthe said steelalloys contain 1 A steelalloy containing 18 to 30 per 2 to 4 percent of molybdenum and "0,1 to centbf-chromium and 4' to 20 per cent' of 0,4 per centof carbon. nickel, 2 to per cent of molybdenum and I amaware that chromium-nickel-steel al- 0,1 to 0.4 er;cent of carbon. loys are already well-known which possessa '52.- Artic es of manufacture intended for 85 high resistibility against the attack of acids. use under exposure to-sulphurous acid at a I am further aware that chromium-nickel high temperature and high pressure, comsteel alloys with small additions of tungsten posed of asteel alloy -containing "18 to '30 are already well known which possess a high per c ent of chromium and 4 to 20 er cent of resistibilityagainst the attack; of sea water. nickel,- 2 to 4 per cent ofmolyb enum and However', all these alloys do not satisfy the -0. 1 to 0.4 per cent of carbon. requirements ath-igh temperatures and high The foregoing specification signed at pressures such as arise,'for instance, in the Cologne, Germany, this 19th day of 'June.

manufacture of cellulose. It is only by the 1923. i addition of 2 to'.4@ per cent of molybdenum i I I that steel alloysof this kind with 0,1 to 0,4 BENNO-STRAUSS. 

